@ only +3C hotter they can handle clocks up to 4.2-4.3GHz if you have it done just right thermal paste included.
both units idle @ 29-33C.
I have not pushed any clock past 4.3GHz with the TX3 so more than that I would only be guessing.
it's certainly not the greatest..
but @ $20 it can't be beat..
I have been OC for years so of course i did it right and i would agree with what your saying it will handle 4.4GHZ that was is limit for me anyway for $20 it can't be beat